Backport API changes needed to fix sticking in EE

These changes are ported over from
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1502 to reduce
the number of merge conflicts that may occur.

changelogs/unreleased/backport-sticking-api-helper-changes.yml

+---
+title: Backport API changes needed to fix sticking in EE
+merge_request:
+author:

lib/api/helpers/runner.rb

@@ -50,10 +50,14 @@ module API
         forbidden!('Job has been erased!') if job.erased?
       end
 
-      def authenticate_job!(job)
+      def authenticate_job!
+        job = Ci::Build.find_by_id(params[:id])
+
         validate_job!(job) do
           forbidden! unless job_token_valid?(job)
         end
+
+        job
       end
 
       def job_token_valid?(job)

lib/api/runner.rb

@@ -113,8 +113,7 @@ module API
         optional :state, type: String, desc: %q(Job's status: success, failed)
       end
       put '/:id' do
-        job = Ci::Build.find_by_id(params[:id])
-        authenticate_job!(job)
+        job = authenticate_job!
 
         job.update_attributes(trace: params[:trace]) if params[:trace]
 
@@ -140,8 +139,7 @@ module API
         optional :token, type: String, desc: %q(Job's authentication token)
       end
       patch '/:id/trace' do
-        job = Ci::Build.find_by_id(params[:id])
-        authenticate_job!(job)
+        job = authenticate_job!
 
         error!('400 Missing header Content-Range', 400) unless request.headers.has_key?('Content-Range')
         content_range = request.headers['Content-Range']
@@ -175,8 +173,7 @@ module API
         require_gitlab_workhorse!
         Gitlab::Workhorse.verify_api_request!(headers)
 
-        job = Ci::Build.find_by_id(params[:id])
-        authenticate_job!(job)
+        job = authenticate_job!
         forbidden!('Job is not running') unless job.running?
 
         if params[:filesize]
@@ -212,8 +209,7 @@ module API
         not_allowed! unless Gitlab.config.artifacts.enabled
         require_gitlab_workhorse!
 
-        job = Ci::Build.find_by_id(params[:id])
-        authenticate_job!(job)
+        job = authenticate_job!
         forbidden!('Job is not running!') unless job.running?
 
         artifacts_upload_path = ArtifactUploader.artifacts_upload_path
@@ -245,8 +241,7 @@ module API
         optional :token, type: String, desc: %q(Job's authentication token)
       end
       get '/:id/artifacts' do
-        job = Ci::Build.find_by_id(params[:id])
-        authenticate_job!(job)
+        job = authenticate_job!
 
         artifacts_file = job.artifacts_file
         unless artifacts_file.file_storage?

lib/ci/api/builds.rb

@@ -86,8 +86,7 @@ module Ci
         # Example Request:
         #   PATCH /builds/:id/trace.txt
         patch ":id/trace.txt" do
-          build = Ci::Build.find_by_id(params[:id])
-          authenticate_build!(build)
+          build = authenticate_build!
 
           error!('400 Missing header Content-Range', 400) unless request.headers.has_key?('Content-Range')
           content_range = request.headers['Content-Range']
@@ -117,8 +116,7 @@ module Ci
           require_gitlab_workhorse!
           Gitlab::Workhorse.verify_api_request!(headers)
           not_allowed! unless Gitlab.config.artifacts.enabled
-          build = Ci::Build.find_by_id(params[:id])
-          authenticate_build!(build)
+          build = authenticate_build!
           forbidden!('build is not running') unless build.running?
 
           if params[:filesize]
@@ -154,8 +152,7 @@ module Ci
         post ":id/artifacts" do
           require_gitlab_workhorse!
           not_allowed! unless Gitlab.config.artifacts.enabled
-          build = Ci::Build.find_by_id(params[:id])
-          authenticate_build!(build)
+          build = authenticate_build!
           forbidden!('Build is not running!') unless build.running?
 
           artifacts_upload_path = ArtifactUploader.artifacts_upload_path
@@ -189,8 +186,7 @@ module Ci
         # Example Request:
         #   GET /builds/:id/artifacts
         get ":id/artifacts" do
-          build = Ci::Build.find_by_id(params[:id])
-          authenticate_build!(build)
+          build = authenticate_build!
           artifacts_file = build.artifacts_file
 
           unless artifacts_file.file_storage?
@@ -214,8 +210,7 @@ module Ci
         # Example Request:
         #   DELETE /builds/:id/artifacts
         delete ":id/artifacts" do
-          build = Ci::Build.find_by_id(params[:id])
-          authenticate_build!(build)
+          build = authenticate_build!
 
           status(200)
           build.erase_artifacts!

lib/ci/api/helpers.rb

@@ -13,10 +13,14 @@ module Ci
         forbidden! unless current_runner
       end
 
-      def authenticate_build!(build)
+      def authenticate_build!
+        build = Ci::Build.find_by_id(params[:id])
+
         validate_build!(build) do
           forbidden! unless build_token_valid?(build)
         end
+
+        build
       end
 
       def validate_build!(build)